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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Mapping of changes in optical and magneto-optical responses of Ni-Mn-Ga thin films across martensitic transformation and strain relaxation
 Makeš, Matěj ; Veis, Martin (advisor) ; Zemen, Jan (referee)
This thesis studies optical and magneto-optical responses of thin epitaxial Ni-Mn- Ga films prepared by magnetron sputtering. The relative permittivity tensor spectra were computed from the spectroscopic ellipsometry data measured both without the external magnetic field and in the out-of-plane magnetic field configuration. For one of the thin film samples, measurements across martensitic transformation were performed and temperature-hysteresis was observed. The analysis of the obtained spectra for thickness- varied series of samples clearly demonstrated the influence of substrate-induced strain and revealed a strong correlation between the out-of-plane lattice parameter and the properties of the obtained spectra. 1
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Optical and magneto-optical spectroscopies of thin NiMnGa films with martensitic transformation
 Makeš, Matěj ; Veis, Martin (advisor) ; Antoš, Roman (referee)
In this thesis we provide a systematic study of optical and magneto-optical properties of thin NiMnGa films - alloys exhibiting magnetic shape memory effect. These layers were prepared by magnetron sputtering. A series of samples with different deposition temperatures, different thicknesses, different stoichiometries and different substrates were measured. The analysis of the obtained results clearly demonstrated the influence of change in strain, which is induced by the substrate, with varying thickness. Also the influence of stoichiometry on the amplitude of the magneto-optical Kerr effect and the influence of the base layer on the structure of the Ni-Mn-Ga layer were demonstrated. 1
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